Audi A6
3.0-litre TDI V6 with 245 PS (C7 generation, EA897). Four-chain timing system — complex and maintenance-intensive; check for chain replacement from 150,000 km if rattling. Camshaft material defect known in early EA897 batches; check service history for camshaft replacement. Cam belt to CR pump every 120,000 km.
Anxiety engine — costly failure looming
190 hp 3.0L with a known problem: camshaft breakage due to material defect. The risk of expensive repairs overshadows any driving pleasure.
Engine Weaknesses 5
The 3.0 TDI EA897 in newer models is affected by camshaft fractures due to material defects. Audi acknowledged the issue via TPI 2043172. Primarily vehicles from production years 2014–2017.
Symptoms: Ticking engine noises exceeding normal diesel combustion levels, increasing power loss, then engine failure
Chain elongation and tensioner wear on the 3.0 TDI CKNB can lead to the chain jumping a tooth. A full overhaul takes 15–20 hours, costing roughly €3,000 upwards.
Symptoms: Rattling on cold start and under load, timing fault codes in OBD, occasional misfires
The bi-turbo 3.0 TDI shows turbocharger wear, partly from inadequate oil supply or deposits. Damage often occurs at high mileage or after long oil-change intervals.
Symptoms: Whistling noise from the engine bay, blue exhaust smoke, power loss especially under load, elevated oil consumption
The 3.0 TDI CKNB suffers from soot deposits in the EGR system. Blocked EGR coolers and sticking EGR valves are common — after software updates the EGR rate was sometimes increased further.
Symptoms: Power loss, rough idle, engine warning light, increased consumption, occasional limp mode
After the diesel recall software update the 3.0 TDI DPF is stressed more heavily and needs to regenerate more often. Frequent short-trip use leads to permanent filter clogging.
Symptoms: Frequent DPF regenerations, power loss, limp mode, DPF warning light, fuel dilution in oil
Vehicle Weaknesses 9
On model years 2015–2018, the locking bolt of the tow bar can fracture, potentially causing the trailer to become detached while driving. Free workshop visit required.
The Multitronic CVT gearbox has a notoriously poor reliability record. Improved on the C7, it remains a risk. Total failure possible from 100,000 km; repair is very costly.
A material defect can cause the camshafts in the 3.0 TDI to fracture, leading to engine damage. Mainly affects vehicles from model year 2014 to early 2017.
The optional air suspension (AAS) is prone to failure through porous air bellows and defective compressors. Repair costs of 600–1,800 EUR per corner are possible.
LED headlights fail due to defective control modules or individual LEDs. Repair is often more expensive than replacement, as modules cannot be replaced individually.
The automatic climate control shows malfunctions from around 60,000 km: incorrect temperature regulation, blower stage issues or complete failure of individual zones on the three-zone system.
Wheel bearings, particularly at the rear axle, show increased wear at higher mileages. Regularly flagged on vehicles from 80,000 km.
On the C7, rust occurs primarily on the underbody and sills, sometimes in hard-to-reach areas. On vehicles over 7 years old, the underbody should be thoroughly inspected.
On V6 and V8 engines, engine mounts often wear from around 50,000 km, causing noticeable vibrations.